What was found
EMERGENCY LANDING- CABIN PRESSURIZATION RUNAWAY. ON DECENT FROM FL390...AROUND FL360 CREW NOTICED CABIN PRESSUIZATION FLUCTION 3000-5000. CABIN PRESSURIZATION SWITCH WAS IN AUTO THE ENTIRE TIME THEY WERE DECENDING, QRH DID NOT SAY SWITCH TO MANUAL SO THEY DID NOT. CREW REPORTS ALL VALVES WERE WIDE OPEN INCLUDING THE SAFETY VALVE. REPORTED CABIN PRESSURE ROSE TO 15,500, THEY RECIEVED THE ECAM WARNING AND DIVED DOWN TO STABILIZE CABIN. AT THIS TIME THE CABIN MASK DROPPED FOR PASSENGERS. ACCOMPLISHED VISUAL EXTERIOR INSPECTION FROM GROUND OF OUTFLOW VALVE. NO CURRENT DEFECTS NOTED. STARTED WORKING AMM 05-51-93-200-001-C-1, INSPECTION AFTER DEPRESSURIZATION EVENT, ACP''D STEPS: 4A, 4B1,B3,B4. COULD NOT ACP STEP 4B2 NOT ABLE TO OVERCOME SPRING PRESS ON SAFETY VALVES , REF AMM 21-31-00-710-006. O2 GENERATORS WERE REMOVED ON LOG PAGE 6965068 GAINED ACCESS TO SAFETY VALVES THROUGH AFT GALLEY AND ACCOMPLISHED STEP 4.B(2) OF POST DEPRESSURIZATION CHECK AMM 05-51-93-200-001-C-1. BOTH VALVES OPS CHECK GOOD.